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Title: Characterization of surface wettability
Authors: Tan, Jasmine Jie Min
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Publisher: Nanyang Technological University
Source: Tan, J. J. M. (2021). Characterization of surface wettability. Final Year Project (FYP), Nanyang Technological University, Singapore.
Project: B288
Abstract: Objective: The author has conducted a series of experiments to characterize and investigate the surface wettability of polydimethylsiloxane (PDMS) after the surface modification technique called Slippery Lubricant-Infused Porous Surfaces (SLIPS). Methods: Different cross-linking ratios of PDMS (1:5, 1:10, and 1:15) will prepared and immersed in varying viscosity of silicone oil (10 cSt, 100 cSt, and 500 cSt) and soaked for the different duration (30 mins, 1 hour, 3 hours, 24 hours and 48 hours). After soaking, results were characterized by 1) contact angle measurement, 2) scanning electron microscopy, 3) degree of swelling and 4) surface roughness. Results: After infusion of silicone oil, it is demonstrated that a higher cross-linking ratio will result in higher contact angle, which will lead to more swelling and higher surface roughness. Similarly, a longer soaking duration will lead to more swelling and higher surface roughness of the samples. It is shown that the viscosity of the silicone oils might not be a big factor in affecting the surface wettability of the samples. Conclusion: SLIPS will be an ideal and simple surface modification for PDMS. In addition, the highest surface wetting is achieved through the lowest cross-linking ratio soaked in the least viscosity of silicone oil.
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:MAE Student Reports (FYP/IA/PA/PI)

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